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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c028fc96eec16474e9d8042ff0aa60bcdc536b3aea5ac05a0c2930dde0a0058' 
  AND token = '6yA9FX5FwopQkKcAipmYgMAveHAR1rSsqKUaX1MvKOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}